Air in primer pump bowl

[BCODERRE]

I ran a clear test line from davco input side to my fuel tank and there were no bubbles in that line but still hab bubbles from davco to primer pump. I replaced the davco 382. Made no difference. At this point I'm sure the lines running from the tanks to the davco are good. The 2 lines at the bottom of the davco have me stumped as I don't know what they are for. Does anybody have a fuel system schematic ?